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Precision Instruments

In 1938, K.R. Larson founded Precision Instruments, Inc. to manufacture the first dial-type torque wrench. Now 65 years and 65 patents later, Precision Instruments has become a leader in the industry, known for providing the most accurate, dependable and reliable torque wrenches in the world. Since its incorporation, Precision Instruments has been a family owned and operated business. Precision Instruments' philosophy, of providing quality and service above all else, has been the key to the company's success. Based on that philosophy, the 65-year tradition of producing all products in-house continues today. Tools Direct can get you any product manufactured by Precision Instruments, please contact our customer care if you are looking for something not found on our site.

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Precision Instruments F.A.Q.

What does the "M" in a D2F150HM stand for?

Memory model Retains the highest torque reading for easy reference. For Quality Control testing, a memory model displays the maximum reading obtained. This is excellent for verifying production torque applications.

How do I use the "M" (Memory model) option properly?

To use the Memory model in the clockwise direction, rotate knurled knob counter clockwise on top of crystal until the memory pointer contacts main pointer. Next turn the dial bezel counter clockwise until the memory pointer is on zero. Place the torque wrench on the fastener and pull on the wrench handle until the desired torque is reached. When the pressure is released the main pointer will return to zero and the memory pointer will remain at the peak torque reached. For counter clockwise direction use, reverse above procedure. The memory model feature can be used to record peak torque when the dial may not be visible. Be careful not to overtorque the fastener or torque wrench.

What does the "L" in a D2F150HL stand for?

Indicator Light Model Indicates when a preset torque level is achieved. Set the dial to the required torque, and the light will go on when the proper torque is reached. This is particularly useful when the dial is not visible.

How do I use the "L" (Lighted) option properly?

To use the Indicator Light Model for clockwise applications, turn the dial until the gold pointer is set at the desired torque (the red pointer for counterclockwise applications). Place the torque wrench on the fastener and pull until the light comes on. Check the bulb and battery if the light fails to light when the pointer touches the gold contact pin.

Is a "M" micrometer style wrench calibrated in the same way as other micrometer style wrenches?NO! The "M" series requires special tools available to perform calibration. DO NOT DISASSEMBLE a "M" wrench as you would other micrometer style wrenches! The mechanism in the "M" does not rely on shims, spacers or blocks to perform calibration. Instead, all calibration is performed externally, quickly, and without the need to disassemble the wrench. This keeps the internal components free from outside contaminates, eliminates calibration kits, and makes "tweaking" the calibration very simple.

How often do torque wrenches require calibration?
The more a wrench is used, the more it will require calibration. Every wrench regardless of use should be calibrated at least every six months to ensure perfect calibration. Production units may require calibration every month, week, or day! Users should be encouraged to maintain wrench calibration and, when establishing their calibration intervals, to request calibration certificates that indicate the readings after the calibration and as the wrench was received.